Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c71b2e5f28df0a…

MALICIOUS

PDF

45.4 KB Created: 2020-10-16 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1f63663236550161b736c3506676bbb6 SHA-1: d6926b20c9014ac9fc2d2ffa80ae29108cfe3bba SHA-256: 10c71b2e5f28df0a0280f8dd0d09940acaba1c28ccdef33c0b04ec218af76ddc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://gettraff.ru/123?keyword=hematoma+subgaleal+frontal+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=hematoma+subgaleal+frontal+pdf In PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/3460351.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/burefokewiruxar-sominaguwe-penapekulu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/gerogewupag-fikupejoku-ratobolut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f88b9c0236e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f87f4399cc68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f88ba3bedbe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f88b9c9366a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f88ba488623b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f873c2a3b343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f88ba927cb6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f871d652d459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f877393f33ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2923e264-4661-44fd-96be-3202d37efa29/30895438115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd99a35-ad99-4644-bf26-ea32d473c0ef/jenodiwofuziwazasafowomut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2642945-9145-4751-9160-21797b353f0d/87647876254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9160c4aa-e17c-4546-a96d-ef461ac3d473/55478437915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6085bbe6-924e-45ac-ad11-b1b0e588b36c/83311871149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb263053-b683-43c7-bbca-9238989d5d26/75011018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19b33fe-e8e3-46b7-af84-557b107e02e4/bobabiraxutuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc26ad6-f7e7-43ad-bd7c-9bb005093f57/nufofelupunixeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21badb23-7e29-4e19-ad61-fce5e30edd3d/watiwunafitiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266ed95e-6250-4a36-b282-6b845c52a28d/72061520886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f834511-af17-4042-9af0-2a2b6368729b/43546561726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31937040-63e6-48cf-afe9-d456ed701ed8/91543094370.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FA 5464 bytes
SHA-256: 372bae5d86b71b8be29c0904e3321c25b04a9196c64d885db5cbbf2b9cc7ffd1
font_01_sfnt_off0000856e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 10088 bytes
SHA-256: 5b59198342b770ec20ffb32214ee2849410895011b3d25e3efc403d0f8d523ae

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